摘要
在转子径向通风冷却系统中,副槽结构、径向风道分布、槽楔出风口直径等参数,直接影响转子风道冷却介质流动特性。为减少转子径向通风系统转子轴向的温差及其热应力,必须使转子沿轴向各径向风道内冷却介质流量分布尽可能均匀。针对转子径向通风冷却系统的结构特点,建立径向通风系统的冷却介质流量分配离散模型。应用该模型对300MW水—氢—氢汽轮发电机和125MW空冷汽轮发电机转子径向通风系统进行计算。分析探讨不同转子副槽结构对径向风道流量分配的影响。研究结果表明,采用变副槽结构设计可较好地调整各径向风道流量偏差,且副槽倾斜角存在最优值。研究结果对汽轮发电机转子径向通风系统的设计具有指导意义。
In the rotor ventilation system with radial ducts,the configuration parameters of sub slot,the distribution of radial ducts,and the diameter of slot wedge directly affect the flow characteristics of coolant in cooling ducts.To reduce temperature difference and thermal stress along axis direction of large turbo generator rotor,the coolant mass flow rate distribution in radius ducts along axis direction of rotor must be uniform.Based on the characteristics of radial ventilation system,a discrete calculation model of the coolant flow distribution of radial ventilation system is built.The computation results of rotor ventilation systems of a 125 MW air-cooled and a 300 MW water-hydrogen-hydrogen-cooled turbine generator with radial ducts are provided.The effect of the configuration parameters of sub slot on mass flow rate distribution in radial ducts is presented.The results show that the tapered sub-slot can provide more uniform coolant mass flow rate distribution in radial ducts,and there exists optimum tilt angle of sub-slot.The results are helpful to the design of radial ventilation system of turbo generator rotor.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第14期138-142,共5页
Journal of Mechanical Engineering
基金
上海高校选拔培养优秀青年教师科研专项基金资助项目(571012)
关键词
汽轮发电机
转子
径向通风
离散模型
流量偏差
Turbo-generator Rotor Radial ventilation Discrete model Flow deviation
